1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * AMD Yellow Carp ACP PCI Driver 4 * 5 * Copyright 2021 Advanced Micro Devices, Inc. 6 */ 7 8 #include <linux/pci.h> 9 #include <linux/module.h> 10 #include <linux/io.h> 11 #include <linux/delay.h> 12 #include <linux/platform_device.h> 13 #include <linux/interrupt.h> 14 #include <sound/pcm_params.h> 15 #include <linux/pm_runtime.h> 16 17 #include "acp6x.h" 18 19 struct acp6x_dev_data { 20 void __iomem *acp6x_base; 21 struct resource *res; 22 bool acp6x_audio_mode; 23 struct platform_device *pdev[ACP6x_DEVS]; 24 }; 25 26 static int acp6x_power_on(void __iomem *acp_base) 27 { 28 u32 val; 29 int timeout; 30 31 val = acp6x_readl(acp_base + ACP_PGFSM_STATUS); 32 33 if (!val) 34 return val; 35 36 if ((val & ACP_PGFSM_STATUS_MASK) != ACP_POWER_ON_IN_PROGRESS) 37 acp6x_writel(ACP_PGFSM_CNTL_POWER_ON_MASK, acp_base + ACP_PGFSM_CONTROL); 38 timeout = 0; 39 while (++timeout < 500) { 40 val = acp6x_readl(acp_base + ACP_PGFSM_STATUS); 41 if (!val) 42 return 0; 43 udelay(1); 44 } 45 return -ETIMEDOUT; 46 } 47 48 static int acp6x_reset(void __iomem *acp_base) 49 { 50 u32 val; 51 int timeout; 52 53 acp6x_writel(1, acp_base + ACP_SOFT_RESET); 54 timeout = 0; 55 while (++timeout < 500) { 56 val = acp6x_readl(acp_base + ACP_SOFT_RESET); 57 if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK) 58 break; 59 cpu_relax(); 60 } 61 acp6x_writel(0, acp_base + ACP_SOFT_RESET); 62 timeout = 0; 63 while (++timeout < 500) { 64 val = acp6x_readl(acp_base + ACP_SOFT_RESET); 65 if (!val) 66 return 0; 67 cpu_relax(); 68 } 69 return -ETIMEDOUT; 70 } 71 72 static void acp6x_enable_interrupts(void __iomem *acp_base) 73 { 74 acp6x_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB); 75 } 76 77 static void acp6x_disable_interrupts(void __iomem *acp_base) 78 { 79 acp6x_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base + 80 ACP_EXTERNAL_INTR_STAT); 81 acp6x_writel(0x00, acp_base + ACP_EXTERNAL_INTR_CNTL); 82 acp6x_writel(0x00, acp_base + ACP_EXTERNAL_INTR_ENB); 83 } 84 85 static int acp6x_init(void __iomem *acp_base) 86 { 87 int ret; 88 89 /* power on */ 90 ret = acp6x_power_on(acp_base); 91 if (ret) { 92 pr_err("ACP power on failed\n"); 93 return ret; 94 } 95 acp6x_writel(0x01, acp_base + ACP_CONTROL); 96 /* Reset */ 97 ret = acp6x_reset(acp_base); 98 if (ret) { 99 pr_err("ACP reset failed\n"); 100 return ret; 101 } 102 acp6x_writel(0x03, acp_base + ACP_CLKMUX_SEL); 103 acp6x_enable_interrupts(acp_base); 104 return 0; 105 } 106 107 static int acp6x_deinit(void __iomem *acp_base) 108 { 109 int ret; 110 111 acp6x_disable_interrupts(acp_base); 112 /* Reset */ 113 ret = acp6x_reset(acp_base); 114 if (ret) { 115 pr_err("ACP reset failed\n"); 116 return ret; 117 } 118 acp6x_writel(0x00, acp_base + ACP_CLKMUX_SEL); 119 acp6x_writel(0x00, acp_base + ACP_CONTROL); 120 return 0; 121 } 122 123 static irqreturn_t acp6x_irq_handler(int irq, void *dev_id) 124 { 125 struct acp6x_dev_data *adata; 126 struct pdm_dev_data *yc_pdm_data; 127 u32 val; 128 129 adata = dev_id; 130 if (!adata) 131 return IRQ_NONE; 132 133 val = acp6x_readl(adata->acp6x_base + ACP_EXTERNAL_INTR_STAT); 134 if (val & BIT(PDM_DMA_STAT)) { 135 yc_pdm_data = dev_get_drvdata(&adata->pdev[0]->dev); 136 acp6x_writel(BIT(PDM_DMA_STAT), adata->acp6x_base + ACP_EXTERNAL_INTR_STAT); 137 if (yc_pdm_data->capture_stream) 138 snd_pcm_period_elapsed(yc_pdm_data->capture_stream); 139 return IRQ_HANDLED; 140 } 141 return IRQ_NONE; 142 } 143 144 static int snd_acp6x_probe(struct pci_dev *pci, 145 const struct pci_device_id *pci_id) 146 { 147 struct acp6x_dev_data *adata; 148 struct platform_device_info pdevinfo[ACP6x_DEVS]; 149 int index = 0; 150 int val = 0x00; 151 u32 addr; 152 unsigned int irqflags; 153 int ret; 154 155 irqflags = IRQF_SHARED; 156 /* Yellow Carp device check */ 157 switch (pci->revision) { 158 case 0x60: 159 case 0x6f: 160 break; 161 default: 162 dev_dbg(&pci->dev, "acp6x pci device not found\n"); 163 return -ENODEV; 164 } 165 if (pci_enable_device(pci)) { 166 dev_err(&pci->dev, "pci_enable_device failed\n"); 167 return -ENODEV; 168 } 169 170 ret = pci_request_regions(pci, "AMD ACP3x audio"); 171 if (ret < 0) { 172 dev_err(&pci->dev, "pci_request_regions failed\n"); 173 goto disable_pci; 174 } 175 176 adata = devm_kzalloc(&pci->dev, sizeof(struct acp6x_dev_data), 177 GFP_KERNEL); 178 if (!adata) { 179 ret = -ENOMEM; 180 goto release_regions; 181 } 182 183 addr = pci_resource_start(pci, 0); 184 adata->acp6x_base = devm_ioremap(&pci->dev, addr, 185 pci_resource_len(pci, 0)); 186 if (!adata->acp6x_base) { 187 ret = -ENOMEM; 188 goto release_regions; 189 } 190 pci_set_master(pci); 191 pci_set_drvdata(pci, adata); 192 ret = acp6x_init(adata->acp6x_base); 193 if (ret) 194 goto release_regions; 195 val = acp6x_readl(adata->acp6x_base + ACP_PIN_CONFIG); 196 switch (val) { 197 case ACP_CONFIG_0: 198 case ACP_CONFIG_1: 199 case ACP_CONFIG_2: 200 case ACP_CONFIG_3: 201 case ACP_CONFIG_9: 202 case ACP_CONFIG_15: 203 dev_info(&pci->dev, "Audio Mode %d\n", val); 204 break; 205 default: 206 adata->res = devm_kzalloc(&pci->dev, 207 sizeof(struct resource), 208 GFP_KERNEL); 209 if (!adata->res) { 210 ret = -ENOMEM; 211 goto de_init; 212 } 213 214 adata->res->name = "acp_iomem"; 215 adata->res->flags = IORESOURCE_MEM; 216 adata->res->start = addr; 217 adata->res->end = addr + (ACP6x_REG_END - ACP6x_REG_START); 218 219 adata->acp6x_audio_mode = ACP6x_PDM_MODE; 220 221 memset(&pdevinfo, 0, sizeof(pdevinfo)); 222 pdevinfo[0].name = "acp_yc_pdm_dma"; 223 pdevinfo[0].id = 0; 224 pdevinfo[0].parent = &pci->dev; 225 pdevinfo[0].num_res = 1; 226 pdevinfo[0].res = adata->res; 227 228 pdevinfo[1].name = "dmic-codec"; 229 pdevinfo[1].id = 0; 230 pdevinfo[1].parent = &pci->dev; 231 232 pdevinfo[2].name = "acp_yc_mach"; 233 pdevinfo[2].id = 0; 234 pdevinfo[2].parent = &pci->dev; 235 236 for (index = 0; index < ACP6x_DEVS; index++) { 237 adata->pdev[index] = 238 platform_device_register_full(&pdevinfo[index]); 239 if (IS_ERR(adata->pdev[index])) { 240 dev_err(&pci->dev, "cannot register %s device\n", 241 pdevinfo[index].name); 242 ret = PTR_ERR(adata->pdev[index]); 243 goto unregister_devs; 244 } 245 } 246 break; 247 } 248 ret = devm_request_irq(&pci->dev, pci->irq, acp6x_irq_handler, 249 irqflags, "ACP_PCI_IRQ", adata); 250 if (ret) { 251 dev_err(&pci->dev, "ACP PCI IRQ request failed\n"); 252 goto unregister_devs; 253 } 254 pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS); 255 pm_runtime_use_autosuspend(&pci->dev); 256 pm_runtime_put_noidle(&pci->dev); 257 pm_runtime_allow(&pci->dev); 258 259 return 0; 260 unregister_devs: 261 for (--index; index >= 0; index--) 262 platform_device_unregister(adata->pdev[index]); 263 de_init: 264 if (acp6x_deinit(adata->acp6x_base)) 265 dev_err(&pci->dev, "ACP de-init failed\n"); 266 release_regions: 267 pci_release_regions(pci); 268 disable_pci: 269 pci_disable_device(pci); 270 271 return ret; 272 } 273 274 static int __maybe_unused snd_acp6x_suspend(struct device *dev) 275 { 276 struct acp6x_dev_data *adata; 277 int ret; 278 279 adata = dev_get_drvdata(dev); 280 ret = acp6x_deinit(adata->acp6x_base); 281 if (ret) 282 dev_err(dev, "ACP de-init failed\n"); 283 return ret; 284 } 285 286 static int __maybe_unused snd_acp6x_resume(struct device *dev) 287 { 288 struct acp6x_dev_data *adata; 289 int ret; 290 291 adata = dev_get_drvdata(dev); 292 ret = acp6x_init(adata->acp6x_base); 293 if (ret) 294 dev_err(dev, "ACP init failed\n"); 295 return ret; 296 } 297 298 static const struct dev_pm_ops acp6x_pm = { 299 SET_RUNTIME_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume, NULL) 300 SET_SYSTEM_SLEEP_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume) 301 }; 302 303 static void snd_acp6x_remove(struct pci_dev *pci) 304 { 305 struct acp6x_dev_data *adata; 306 int ret, index; 307 308 adata = pci_get_drvdata(pci); 309 if (adata->acp6x_audio_mode == ACP6x_PDM_MODE) { 310 for (index = 0; index < ACP6x_DEVS; index++) 311 platform_device_unregister(adata->pdev[index]); 312 } 313 ret = acp6x_deinit(adata->acp6x_base); 314 if (ret) 315 dev_err(&pci->dev, "ACP de-init failed\n"); 316 pm_runtime_forbid(&pci->dev); 317 pm_runtime_get_noresume(&pci->dev); 318 pci_release_regions(pci); 319 pci_disable_device(pci); 320 } 321 322 static const struct pci_device_id snd_acp6x_ids[] = { 323 { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID), 324 .class = PCI_CLASS_MULTIMEDIA_OTHER << 8, 325 .class_mask = 0xffffff }, 326 { 0, }, 327 }; 328 MODULE_DEVICE_TABLE(pci, snd_acp6x_ids); 329 330 static struct pci_driver yc_acp6x_driver = { 331 .name = KBUILD_MODNAME, 332 .id_table = snd_acp6x_ids, 333 .probe = snd_acp6x_probe, 334 .remove = snd_acp6x_remove, 335 .driver = { 336 .pm = &acp6x_pm, 337 } 338 }; 339 340 module_pci_driver(yc_acp6x_driver); 341 342 MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); 343 MODULE_DESCRIPTION("AMD ACP Yellow Carp PCI driver"); 344 MODULE_LICENSE("GPL v2"); 345